15. has a rechargeable battery

The battery can be recharged and used over again.

Beats by Dre Powerbeats 2 Wireless

Westone UM3X RC

14% have it

16. has an in-ear form

The in-ear device is ultracompact and lightweight, with little or no interference with earrings, spectacles, hats, or hairstyles. It is inserted in the ear canal itself and blocks out a lot of environmental noise. It has stronger bass tones and is unlikely to fall out of the ear.

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